astro.wikisort.org - Asteroid

2608 Seneca, provisional designation 1978 DA, is a stony asteroid and sub-kilometer near-Earth object of the Amor group, approximately 0.9 kilometers in diameter. It was discovered on 17 February 1978, by German astronomer Hans-Emil Schuster at ESO's La Silla Observatory in northern Chile, and named after Roman philosopher Seneca.[3][4]

2608 Seneca

Discovery [1]
Discovered by	H.-E. Schuster
Discovery site	La Silla Obs.
Discovery date	17 February 1978
Designations
MPC designation	(2608) Seneca
Pronunciation	/ˈsɛnɪkə/[2]
Named after	Seneca the Younger (Roman philosopher)[3]
Alternative designations	1978 DA
Minor planet category	NEO · Amor [1][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 1
Observation arc	38.92 yr (14,217 days)
Aphelion	3.9532 AU
Perihelion	1.0777 AU
Semi-major axis	2.5154 AU
Eccentricity	0.5716
Orbital period (sidereal)	3.99 yr (1,457 days)
Mean anomaly	353.12°
Mean motion	0° 14m 49.56s / day
Inclination	14.682°
Longitude of ascending node	167.37°
Argument of perihelion	37.350°
Earth MOID	0.1321 AU · 51.5 LD
Physical characteristics
Dimensions	0.9 km[1][5][6] 1.0±0.3[6]
Synodic rotation period	8 h[6]
Geometric albedo	0.15±0.03[6] 0.20 (derived)[5] 0.21[1]
Spectral type	Tholen = S [1] · S [5] B–V = 0.826[1] U–B = 0.454[1]
Absolute magnitude (H)	17.52[1] · 17.59[5][7] · 17.73[6]

Orbit

Seneca orbits the Sun at a distance of 1.1–4.0 AU once every 3 years and 12 months (1,457 days). Its orbit has an eccentricity of 0.57 and an inclination of 15° with respect to the ecliptic.[1]

The body's observation arc begins with its official discovery observation in 1978, as no precoveries were taken, and no prior identifications were made.[4]

Close approaches

Seneca has an Earth minimum orbital intersection distance of 0.1321 AU (19,800,000 km), which corresponds to 51.5 lunar distances.[1] On 22 March 2062, it will pass 0.254 AU (38,000,000 km) from the Earth.[8]

Physical characteristics

In the Tholen taxonomy, Seneca is a stony S-type asteroid.[1]

Photometry

In March 1978, a photometric observations taken by Degewij and Lebofsky at the Lunar and Planetary Laboratory, Arizona, using a 154-cm reflector, gave a rotational lightcurve with a rotation period of 8 hours and a brightness amplitude of 0.4 (0.5) magnitude (U=2).[6]

Radiometry

In addition, radiometric observations by L. and M. Lebofsky with the 71-cm reflector gave a mean-diameter of 1.0±0.3 kilometers and albedo of 0.15±0.03.[6]

Diameter and albedo

The Minor Planet Center classifies Seneca as an object larger than 1 kilometer ("1+ KM Near-Earth Object"),[4] while Collaborative Asteroid Lightcurve Link derives an albedo of 0.20 and a diameter of 0.9 kilometers based on an absolute magnitude of 17.59.[5] In 1994, astronomer Tom Gehrels published a diameter of 0.9 kilometers with an albedo of 0.21 in his Hazards Due to Comets and Asteroids.[1]

Naming

This minor planet was named after Roman philosopher and statesman Lucius Annaeus Seneca (c. 4 BC – AD 65), also known as "Seneca the Younger" or simply "Seneca".[3] The approved naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6835).[9] The lunar crater Seneca was also named in his honor.[3]

References

External links

• Hazards Due to Comets and Asteroids, Tom Gehrels (1994/5)
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• 2608 Seneca at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• 2608 Seneca at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• 2608 Seneca at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2608) Seneca

(2608) Seneca ist ein Asteroid des Amor-Typs, der am 17. Februar 1978 von Hans-Emil Schuster an der Europäischen Südsternwarte in La Silla entdeckt wurde.

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- [en] 2608 Seneca

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[fr] (2608) Sénèque

(2608) Sénèque est un astéroïde Amor découvert le 17 février 1978 par l'astronome allemand Hans-Emil Schuster.

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[ru] (2608) Сенека

(2608) Сенека (лат. Sĕnĕca) — небольшой околоземный астероид из группы Амура (III), который принадлежит к светлому спектральному классу S. Он был открыт 17 февраля 1978 года немецким астрономом Г.-Э. Шустером в обсерватории Ла-Силья и назван в честь известного древнеримского философа Сенеки[1].

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